pandas基于列中的相同值合并数据帧

i have 2 dataframe as below:

我有2个数据帧如下：

   student_name student_id   
1  may          0000  
2  june         1111  
3  july         2222 

  member_id member_name school_name
1 A0        april       MIT
2 B0        may         NIT
3 C0        june        LIT